Around 4 p.m. a man carrying a 9-inch knife and a baseball bat entered the gun shop and smashed a display case, according to the Washington County Sheriff’s Office. His apparent aim? An unloaded semi-automatic handgun.

The shattered gun case at the Discount Gun Sales shot on SW Beaverton-Hillsdale Highway as of July 25, 2013. (Courtesy of the Washington County Sheriff’s Office.)

The store’s manager then grabbed his own gun. That gun, however, was loaded.

“The store manager called Sheriff’s Deputies and reported the man smashed a display case and removed a handgun,” according to a sheriff’s office news release. “The manager said he had his gun pointed at the robber, keeping him detained until the deputies arrived.”

The suspect has been identified by the sheriff’s office as 22-year-old Derrick Mosley.

“Mosley is lucky to be alive,” Ray said.

The 22-year-old has been arrested, and faces charges that include First Degree Robbery, First Degree Theft, Unlawful Possession of a Firearm, and Second Degree Criminal Mischief. He’s being held at the Washington County Jail on $250,000 bail.

Mosley has previous convictions for Criminal Trespassing and Disorderly Conduct in Multnomah County, according to KOIN’s criminal records search.

Sheriff’s Office Spokesperson Bob Ray told KOIN 6 News that the manager of the store isn’t ready to talk to media and ended up closing up shop for the day.

“Fortunately, no one was injured in the robbery,” Ray reported in the news release. “It is not known what Mr. Mosley’s intentions were once he had the handgun in his possession.”